App.js

import React from 'react';
import ChatScreen from './Screens/ChatScreen/ChatScreen';
import PasswordScreen from './Screens/PasswordScreen/PasswordScreen';
import { createStackNavigator } from '@react-navigation/stack'
import { NavigationContainer } from '@react-navigation/native';
const Stack = createStackNavigator();

const App = () => {
  return (
    <NavigationContainer>
      <Stack.Navigator initialRouteName='password'>
        <Stack.Screen options={{title: 'Password'}} name='password' component={PasswordScreen} />
        <Stack.Screen options={{title: 'Chat', headerBackTitle: 'Logout'}} name='chat' component={ChatScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  )
}

export default App;